Goodwill and Other Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 53,261	$ 77,726
Gross Carrying Amount	196,695	250,338
Accumulated Amortization	143,434	172,612
Amortization expense for intangible assets	13,800	17,600	31,500
Estimated amortization expense for the next five years
2014	8,500
2015	7,250
2016	6,750
2017	3,750
2018	3,500
Customer related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	150,307	183,862
Accumulated Amortization	110,889	129,904
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,126	1,347
Accumulated Amortization	1,024	1,310
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,211	6,909
Accumulated Amortization	5,273	5,503
Technology related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	27,185	29,588
Accumulated Amortization	18,931	17,551
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,113	18,685
Accumulated Amortization	2,969	11,688
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,753	9,947
Accumulated Amortization	$ 4,348	$ 6,656